function overlay()
{
    //document.getElementById("bg_overlay").style.height = document.body.scrollHeight + 23 + "px";	
    try 
    {
        var sizeXY = getSizeXY();
        document.getElementById("bg_overlay").style.height = sizeXY[1] + 23 + "px";	
    }
    catch(ex){}
}
function hideOverlay() 
{
    try
    {
		document.getElementById("img_overlay").style.display = "none";
		document.getElementById("bg_overlay").style.display = "none";
		for(var i=0;i<x.length;i++){x[i].style.display = "block"};
    }
    catch(ex){}
}